feat: Add Support for Proxy with Interceptor (#77)

proxy/certmanager/cache.go

@@ -0,0 +1,45 @@
+package certmanager
+
+import "sync"
+
+// InMemoryCache implements CertificateCache using an in-memory map
+type InMemoryCache struct {
+	mu    sync.RWMutex
+	cache map[string]*Certificate
+}
+
+// NewInMemoryCache creates a new in-memory certificate cache
+func NewInMemoryCache() *InMemoryCache {
+	return &InMemoryCache{
+		cache: make(map[string]*Certificate),
+	}
+}
+
+func (c *InMemoryCache) Get(hostname string) (*Certificate, bool) {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	cert, found := c.cache[hostname]
+	return cert, found
+}
+
+func (c *InMemoryCache) Set(hostname string, cert *Certificate) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	c.cache[hostname] = cert
+}
+
+func (c *InMemoryCache) Clear() {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	c.cache = make(map[string]*Certificate)
+}
+
+func (c *InMemoryCache) Size() int {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	return len(c.cache)
+}